Carburetor



J. L. WALKER Jan. 7, 1930.

CARBURETOR Filed Feb. 6. 1926 2 Sheets-Sheet l 6 Jvsephl}. Wallflsv'5141mm fo'c Jan. 7, 1930. J. 1.. WALKER 1,742,429

CARBURET'OR File Feb- 1926 2 Sheets-Sheet 2 nlznlmum Ljillillllu WWJoscphL. Well/fer avwemroz I I I Patented Jan. I, 1930 UNITED STATESPATENT OFFICE Josnrn 1.. WALKER, or BATON ROUGE, LOUISIANA CARIBURETOBApplication filed February ing and repairing them.

A further object is to provide a carburetor utilizing a rotary valvewhich can be shifted at will to regulate the amount of mixture deliveredfrom the carburetor, the construction and operation of the valve beingsuch as to proportionately increase or reduce the flow of air and fuelwhen the mixture deliv ered from the carburetor is increased or reducedin volume.

With the foregoing and other objects in View which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed may be made within thescope of what is claimed without departing from the spirit of theinvention.

In the accompanying drawings the preferred form of the invention hasbeen shown.

In said drawings,

Figure 1 is a top plan view of the carburetor.

' Figure 2 is a side elevation thereof.

Figure 3 is a section on line 33 Figure 1. Figure 4 is a section on line.4-4 Figure 2. Figure 5 is a section on line 5-5 Figure 3. Figure 6 is asection on line 66 Figure 3. Figure 7 is a view partly inelevation andpartly in section showing more or less in diagram the cooperating portsin one side portion of the carburetor.

Figure 8 is a perspective view of the nozzle sleeve.

Referring to the figures by characters of reference 1 designates thecasing of the car buretor provided with an air intake passage 2 and anoutlet passage 3, the two passages being preferably in alinement andspaced apart by a substantially cylindrical intermediate portion 4 thebottom of which is recessed as at 5 so as to provide a circular seat. Apartition 6 partially closes communication between the interior of thecentral portion 4 8, 1928. Serial No. 86,557.

and the inlet passa e 2 while another partition 6, partially c osescommunication between the outlet passage 3 and the intermediate portion4. As shown particularly in Figures 5, 6 and 7 the lower edges of thesepartitions are inclined so that each of the partitions overhangs theopening throughv communication is established between which the centralportion 4 and the adjacent passages 2 or 3.

Mounted for rotation within the intermediate portion 4 of the casing isa cylindrical valve 7 within diametrically opposed portions of which areformed ports 8 and 9 adapted to communicate with the passages 2 and 3respectively. As shown articular-1y in Figure 7 the port 8 has aninclined advancing wall 10 so that the port is wider at the bottom thanat the top. It might be stated that the port 9 is of the same shape andarrangement as the port 8. Thus it will be seen that when valve 7 isrotated the widest portion of each of the ports'8 and 9 will firstregister with the lowermost portion of the opening or port 11 or 12formed beneath adjacent partition 6 or 6. As the inclined edges 6 and 10are pitched in opposite direc tions respectively, it will be obviousthat during this relative movement of the valve while being turned inone direction the clearance between the crossed inclined edges of theports 8 or 9 and 11 or 12 will be gradually increased both in width andheight. In this connection attention is called to Figure 7.

The top of the valve 7 is closed by an integral cap 13 provided with anannular flange 14. Formed beneath this flange are lugs 15 adapted toride upon inclined cam surfaces 16 located upon the intermediate portion4 of the casing 1- at diametrically opposed points. An arm 17 isextended from the cap 13-and constitutes means whereby the cap and thevalve 7 can be rotated for the purpose of controlling the flow of airand gas through the ports as heretofore explained. It will be obviousthat when the cap is turned in one direction for opening the portsthelugs 15 will ride upwardly on the cam surfaces 13 is rotated in theop site direction,this motion will be reverse the valve movinglongitudinally back to its initial position while, at the same time, theports are gradually closed.

The bottom of the recess 5 is provided with a drain 0 ening 18 forcarrying 01f surplus liquid fuel. A nipple 19 is provided at the centerof this recess and has a passage 20 extending therethrough. The upperend of the passage is flared as at 21 to provide a valve seat while thelower end of the passa e is also flared as at 22 to provide a seat or atapered plug 23 ground or otherwise properly fitted to its seat so as toprovide a sufficiently tight connection. This plug is provided with oneor more wings 24 whereby it can be removed readily from its seat 22. A.passage 20 within the nipple communicates with a laterally extendingpassage 25 formed within a tubular arm 26 extending laterally from theintermediate portion 4 of the car uretor casing. A .fuel suppl pipe, notshown, is adapted to be couple to this arm 26.

A tube 27 is disposed within the intermediate portion of the carburetorcasing and has its counterbored lower end 28 fitted snugly upon thenipple 19. This tube is concentrio with the valve 7 and has its u perend 30 terminating close to the cap 13 of t e valve.

The tube constitutes a nozzle adapted to communicate with the passage 20and formed within this tube at different elevations are small ports orvents 29 through which liquid fuel is adapted to be delivered in jetsinto the mixing chamber 30, which is the space surrounded by the valve7.

A screw 31 is extended through the middle portion of the cap 13 and hasa head 32 at its outer end. A stem 33 projects. from the other end ofthe screw and is located within the tube 27, this stem being provided atits free end with a needle valve 34 normally enga 'ng the seat 21.

or the purpose of holdin the parts of the carburetor properly assem leda relativel stiff spring wire 35 is arranged outside of t e casing 1with its end portions turned inwardly toward each other. One of theseend portions, 36, is seated within a recess 37 in the outer end of plug23 while the other end portion 36 is seated within a recess 38 formed inthe middle portion of the head 32. I

Thus the spring serves to hold the valve 7 pressed yieldingly into thecasing while at the same time plug 23 is held firmly to its seat.

The screw 31 is adapted to be adjusted so that when the ports 8, 9, 11and 12 are closed, valve 34 will be in engagement with itsseat 21. Thusitwill be seen that by rotating valve 7 as heretofore explained it willnot only open the ports 8, 9 and 11 and 12 but the action of the lugs 15on the cam faces 16 will result in the valv e being slid or shiftedlongitudinally so as thereby to lift valve 34 off of its seat 21 andemit a predetermined amount of 1i uid fuel provided by t e tube 27. Thusfuel will rise within the tube 27 and a small amount will be initial]delivered through the lowermost ports 29, t is amount bein the correctuantity to be mixed with t 0 .volume 0 air initially admitted throughthe partly opened ports 8, 9, 11 and 12. As the opening of these lastnamed ports is continued thereby admittin a reater quantity of an to themixing cliam er 30 and delivering a greater to enter the reservoiramount of the combustible mixture to the passage 3, the supply of liquidfuel admitted to the tube 27 will be increased by the further opening ofvalve 34 so that fuel can not onl be delivered from the lowermost ports29 ut will rise and be delivered from orts at higher levels. Thus as theamount 0 fuel is increased the number of ports 29 through which it isdelivered is increased and the liquid fuel thus delivered into the mixinchamber will be thoroughly commingled wit the air admitted thereto. Thearran ement of the orts and valves is such that this mixture W111 alwaysbe in proper pro ortions irrespective of the amount of air an fuel beingsupplied to the mixin chamber.

travel of the air flowing through the car-- buretor, thus insuring abetter mixture of the li uid fuel with the air than would be possib eshould the liquid fuel be delivered along lines substantially parallelwith the direction of the flow of the air.

For the purpose of locking the screw 31 adjustably to the cap 13 a locknut 39 is mounted on the screw and bears firmly against the cap.

By removing spring 35 the valve 7 can be lifted readily out of thecasing 1, tube 27 can be removed, plu 23 can be withdrawn from its seat22 and the entire carburetor structure can thus be readily cleaned orrepaired without requiring special tools or tools of any kind.

Any surplus liquid fuel that may accumulate within the mixing chamber isfree to flow outwardly through the vent 18 through a pi e, not shown, toa fuel container.

at is claimed is:

In a carburetor a casing, a combined stitutin means for opening the fuelcontrol ling va ve, thereby to 1 increase the flow of fuel in proportionto the increase in the flow of air to the mixing chamber, the number 5of the ports in the nozzle through which the liquid fuel is deliveredincreasing as the amount of fuel is increased in the nozzle, a fuelsupply passage leading to the fuel controlling valve and having anopening, a tapered plug constituting a closure for said opening, and aspring yoke embracing the carburetor casing and having its terminalsextended toward each other, one of said terminals bearing against theplug and the other terminal exerting a pressure against thethrottlevalve, thereby to hold the plug and throttle valve firmly totheir seats.

In testimony that I claim the foregoing as my own, I have hereto afiixedmy signature. 2o JOSEPH L. WALKER.

